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Question
On a certain sight-seeing tour, the ratio of the number of Indians to the number of Chinese was 5 to 2. What was the number of Americans on the sight-seeing tour?
(1) On the sight-seeing tour, the ratio of the number of Chinese to the number of Americans was 5 to 11.
(2) The number of Indians on the sight-seeing tour was less than 30
Options:
A .  If the question can be answered with statement 1 alone
B .  If the question can be answered with statement 2 alone
C .  If both statement 1 and statement 2 are needed to answer the question and
D .  If the question cannot be answered even with the help of both statements
Answer: Option C
:
C
Given Indians: Chinese = 5:2
(1) Chinese: Americans = 5:11, it is insufficient
(2) Indians<30; This alone is insufficient
Together, I:C:A = 25:10:22 (all have to be integers!) thus I=25 and A=22.

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